I recently saw a domestic tour operator using aircraft with foreign registry. The pilots had U.S. CPLs. Can foreign-registered aircraft operate commercially within the U.S.A, in an operation where flights begin and end within the U.S.A.?
A certificate holder may operate in common carriage, and for the carriage of mail, a civil aircraft which is leased or chartered to it without crew and is registered in a country which is a party to the Convention on International Civil Aviation if— [...]
And US pilots may fly foreign aircraft within the US.